Usage patterns
莫大な財産a vast fortune
He left a vast fortune to his son.
莫大な借金an enormous debt
The company went bankrupt while carrying an enormous debt.
莫大な費用がかかるto incur enormous costs
Building a new factory requires enormous costs.
莫大な利益を得るto reap enormous profits
He reaped enormous profits from that investment.
莫大な時間を費やすto spend a huge amount of time
We spent a huge amount of time on that project.